3.—(1) The operator of any tank container or tank wagon shall ensure that all the documents referred to in paragraph 1 are kept throughout the period that they remain valid at the address within Northern Ireland from which the deployment of the tank container or tank wagon concerned is controlled.
(2) It shall be sufficient compliance with sub-paragraph (1) in circumstances where (by virtue of the fact that the owner does not have a place of business in Northern Ireland) the operator of the tank container or tank wagon is not its owner, if—
(a)photocopies of the documents concerned are kept at the operator’s place of business; or
(b)the documents concerned are readily available from the owner of the tank container or tank wagon.